Obviously Naruto is the central character as it's about his transformation into an immortal sage. Sasuke is often involved too, as their relationship is a key part of the Naruto universe. Kakashi might also be included as Naruto's former teacher and a respected figure in the village.
The main character is Naruto without a doubt. But other characters like Tsunade could be involved. Since she is the Hokage, she might have to deal with the implications of Naruto's immortality. And characters from other villages like Gaara might also be part of the story. Gaara, being Naruto's friend, could have his own interactions with Naruto as an immortal sage, either for diplomatic reasons or in battles against common enemies.
Sometimes other characters like Tsunade can be involved. She has a long - standing relationship with Jiraiya. In fanfiction, her presence can add a lot of drama, especially when it comes to her reactions to Jiraiya's pervy antics.
In Naruto Rikudo Sage fanfiction, the main characters usually include the Rikudo Sage, Naruto, and the various kages. The kages play important roles as they are the leaders of the ninja villages and their actions can be influenced by the knowledge or power related to the Rikudo Sage. Also, characters like Kakashi could be involved as they are important figures in the Naruto universe and could be connected to the Rikudo Sage's story in some way.
Sasuke could be another key character. There could be a plot where Sasuke is initially skeptical about Naruto's new chakra sage abilities but then comes to see their value in protecting the shinobi world. And Jiraiya, as Naruto's former mentor, might appear in flashbacks or even in some spiritual form to give Naruto advice on his chakra sage journey.
In 'naruto immortal god fanfiction', Naruto is the key character. But other characters like Hinata may also be significant. Hinata's love for Naruto could be a driving force for Naruto's actions even as he becomes an immortal god. Her unwavering support might be what keeps Naruto grounded in his humanity, or it could also be a source of conflict if Naruto's new powers put a strain on their relationship.
Often, Naruto himself might be associated with it. Since he is the main character in the original series, fanfiction writers may give him sage eyes and explore how it changes his character and abilities.
Naruto himself is often a central character in 'naruto destruction fanfiction'. Since he is the main protagonist of the original series, fanfiction writers like to put him in situations where he has to deal with destruction. Sasuke is also frequently involved as his rival, and their relationship can be explored in the context of destruction, like if they have to work together to stop a greater threat of destruction.
Well, Naruto is obviously a main character in most of these. But there could also be Sasuke. He might be either an ally or an adversary in relation to the dagger. For example, if the dagger has a power that can either be used for good or evil, Sasuke could be tempted by its darker potential.
Some fanfictions might also include characters like Kakashi in important roles. As Naruto's former teacher, he could be a guiding figure or someone who has to adapt to Naruto's new level of power. He might also be involved in trying to keep Naruto's power in check if it starts to have negative effects on the ninja world.
Naruto himself is often a main character in naruto helmet fanfiction. Since he is the protagonist of the original series, it makes sense that he would be involved with a special helmet in fan - created stories. He could discover the helmet's powers and use them to become even stronger.
Naruto himself is often involved. Since he's the main character of the original series, in fanfiction with loopholes, he might use some loophole to achieve his goal of becoming Hokage faster or getting stronger in a unique way. Sasuke could also be a main character in such fanfictions. He might find a loophole to deal with his quest for revenge or his power - seeking in a different manner.